assertionLine function ~ 71.4%

function assertionLine(assertion: E2EAssertion): string {
  switch (assertion.type) {
    case "url-changed":
      return `  await expect(page).not.toHaveURL('${escapeString(assertion.expected ?? "")}');`;
    case "url-contains":
      return `  await expect(page).toHaveURL(new RegExp('${escapeString(assertion.expected ?? "")}'));`;
    case "visible-text":
      return assertion.expected
        ? `  await expect(page.getByText('${escapeString(assertion.expected)}')).toBeVisible();`
        : `  // Expect visible validation feedback`;
    case "element-visible":
      return `  await expect(page.locator('${escapeString(assertion.selector ?? "")}')).toBeVisible();`;
    case "element-hidden":
      return `  await expect(page.locator('${escapeString(assertion.selector ?? "")}')).toBeHidden();`;
    case "toast-message":
      return `  await expect(page.locator('${escapeString(assertion.selector ?? "[role=\\'alert\\']")}')).toBeVisible();`;
    case "field-value":
      return `  await expect(page.locator('${escapeString(assertion.selector ?? "")}')).toHaveValue('${escapeString(assertion.expected ?? "")}');`;
    case "field-error":
      return `  await expect(page.locator('${escapeString(assertion.selector ?? "")}')).toBeVisible();`;
    case "redirect":
      return `  await expect(page).toHaveURL(new RegExp('${escapeString(assertion.expected ?? "")}'));`;
    case "response-ok": {
      const url = escapeString(assertion.selector ?? "");
      const status = assertion.expected ?? "200";
      const urlFragment = url.split("/").pop() ?? url;
      return [
        `  // HTTP response assertion: ${assertion.description ?? `${url} → ${status}`}`,
        `  // To assert strictly, add before the submit action:`,
        `  //   const responsePromise = page.waitForResponse(r => r.url().includes('${urlFragment}') && r.status() === ${status});`,
        `  //   const response = await responsePromise;`,
        `  //   expect(response.status()).toBe(${status});`,
      ].join("\n");
    }
  }
}